books.google.co.uk - On October 14th, 1808, Napoleon persuaded Herzog Peter Friedrich Ludwig of Oldenburg to join the Confederation of the Rhine by the Treaty of Erfurt – the military contingent to be maintained by the duchy was set at an infantry battalion of 800 men in six companies. Similarly, Friedrich August, Herzog...https://books.google.co.uk/books/about/Napoleon_s_German_Allies_2.html?id=q1jktT2_lt4C&utm_source=gb-gplus-shareNapoleon's German Allies (2)